Chilling roll



June 3, 1952 Filed Nov. 5, 1947 B. OFFEN CHILLING ROLL 2 SHEETS-SHEET lIN VEN TOR. W #124 A 7' TORNE Y B. OFFEN CHILLING ROLL June 3, 1952 2SHEETS-SHEET 2 Filed Nov. 5, 1947 INVENTOR.

ATTORNEY leaving the roll.

Patented June 3, 1952 UNITED STATES PATENT OFFICE CHILLING Rot-Lfiernard Offen, Chicago, ill. Application november 5, 1947'; Serial No.784,125 3Claims. (01.- 257-95) This invention relates to chilling orcooling r'olls for drying equipment and,;1iiore particularly, to achilling or cooling roll adapted to chill or cool a fibrous web after ithas attained a predetermined temperature. H

The chief object of the present invention is to provide a hollowchilling roll having a thin film of cooling medium therein permittingthe mass of the'roll to be greatly reducedthereby eliminating thenecessity of driving the roll since the fibrous web passing thereoverserves to rotate the roll and to discontinue its rotation.

An object of the presentinvention is to provide a chilling roll of noveldesign in which a predetermined film thickness'of cooling medium such aswater is maintained adjacent the interior wall of the roll. 5

A further object of the present invention is to provide a chilling rollhaving a scooprlike member adapted to remove cooling medium continuouslyfrom the interior of the wall to maintain a predetermined depth ofcontinuously changing cooling medium adjacent the interior wall of theroll, and a member disposed adjacent s c yw l o a i t d ums-ad a n sucS1 face thereby providing imprgved heat transfer.

Astill further object is to provide a chilling roll in; which means areprovided to control the v li e q lins medi su p d o herq in response tochanges in temperature of medium A still further object is to provide achilling r9 i c u ng.. .sQQ0ni mem r. ad pt d to rem e .c q f slme iumfr m. th i e rv i the roll, such merhbenbeing adjustable to vary thedepth ofcooling Ifiediunimaintained adjacent the interior wall of'theroll. Qtherobjects of the inventionwill be readily perceived from thefollowing description. a r

This invention relates to a chilling roll for 050 ing heated fibrouswebs and comprises a rotatable Hollow roll provided With means fOl'Supplying coblifig medium Within the interior thereof. A

scoop-like member is disposed. within the roll and serves to maintain acooling medium film of predetermined depth adjacent theinterio'i wail ofthe roll. The scoop-like memberisconnected to a discharge pipe to permitmedium toiberemoved from the roll. Preferably, thescoop-like member isadjustable to permit" the depth of the film to be varied. A turbolatormember may be ill Sed' adjacent the interiorwa11otherp11 t0 o'vercomepossible slippage of water thereaga inst to'irripiove heat transfer,C'ontrol means iiiay belpro edto regulate the supply of cooling mediumto the roll".

r The attached drawings illustrate preferred embodiments of myinvention,in which Figure 1 is a sectional view taken longitudinally of a chillingroll constructed in accordance with the present invention;

Figure 2 is a sectional View taken on the line 2-2 of'Figure 1;

Figure 3 is a sectional view in exaggerated scale illustrating the scoopmember; I

Figure 4 is a diagrammatic View illustrating the manner in which thescoop member may be adjusted;

' Figurej is a sectional view of a modification of the presentinvention;

Figures is a sectional View taken on the line 6+6 of Figure 5; and VFigure 7 is a diagrammatic view illustrating the turbolator disposedadjacent the interior longitudinal wall of the roll.

Referring to the drawings; there is shown in Figure 1 the chilling roll2 of the present invention having its'spindles 3 mountedin suitablebearings 4 disposed in the frame 5 of the apparatus', Roll 2 is: hollowand consists of end plates 6- and 1 connected by cylindrical wall 8forming the cooling surface of the roll. As shown in Figure 1, end plateI is removable to permit the scoop member to be disposed within theinterior of the roll.

A stationary supply pipe 9 for'supply of cooling medium such as Water tothe interior of roll 2 extends through a spindle 3 into the interior ofthe roll and is supported in position at one end of the roll by asuitable bearing [0 mounted on end plate 6. The opposite end of pipe 9may be supported by flanges I2 mounted on drain box [3 bolted as shownat I4 to the frame of the apparatus. A valve H is disposed in pipe! andmay be actuated as hereinafter described to regulate the volume of watersupplied to the interior of the: roll. Nozzles M are provided in pipe 9through which high velocity jets of water may be directed against theinterior surface of wall 8.

Water is removed from the interior of the roll 2 through a scoop memberi5 disposed in the interior of the roll adjacent Wall 8 and supported bypipe [3 threadedly connected to discharge pipe [1. Discharge pipe I!passes through spindle 3, surrounding pipe 9' so that leaving waterflows within pipe l1 and eXterio'rly of pipe 9. Pipe I1 is capped at [8to direct leaving water through pipe I9 to drain box I3 from whichitinay be discharged to a sump or sewer. It will; be appreciated pipe 9passes through the capped portion IS; the purpose of the capped portionbeing to close the end of discharge pipe II. If desired, as shown inFigure 1, water in pipe I9 may be maintained under pressure by means ofvalve 20 disposed in pipe I9 and check valve 2I disposed in pipe 22connected to pipe I9.

As shown in Figures 2 and 3 scoop member I5 is adjustable. Member I5includes a scoop portion 23 threadedly connected to a collar 24 securedto pipe I6. Preferably, a set screw 25 is provided in wall 8 of roll 2adjacent the position of the scoop portion 23. Thus, when it is desiredto adjust the water thickness in the roll the scoop portion may be movedtoward or from wall 8. As shown in Figures 2 and 4, scoop portion 23 maybe provided with a socket 25 for the reception of a key 26. Removal ofset screw 25 permits insertion of key 26 within socket 25 for desiredadjustment of scoop portion 23. It will be appreciated other forms ofscoops may be employed and other means may be provided if desired torender the scoop adjustable to vary the depth of the film of watermaintained adjacent wall 8.

In operation, roll 2 is rotated by means of the heated fibrous webpassing thereover at a speed within the range of 100 to 1200 feet perminute. At such speed, water discharged within the roll is thrownagainst the interior surface of wall 8 due to centrifugal forces. As thewater is carried around on such surface, scoop l5 scrapes off the waterfrom the surface and causes such leaving water to fiow through pipe I6into discharge pipe I1 and then into pipe I9 to drain box I3 therebyremoving water from the roll. Scoop I5 may be adjusted as describedabove to regulate the thickness of film maintained within the roll.Preferably, such film so maintained may vary in depth between to ScoopI5 is shown in a vertical position. The scoop, if desired, may be placedin a horizontal position or in any desired intermediate position andsatisfactory results may be achieved.

Supplemental means may be employed for driving the chilling roll ifdesired, and I have indicated such means by placing a gear 26 (shown indotted outline) on the spindle 3 of roll 2. As stated above, suchsupplemental equipment is not necessary due to the light weight of thepresent construction, but it may be employed if desired. r

In Figure 5, I have shown a modified form of my invention. Supply pipe 9extends through an open end of roll 2 into the interior thereof, the endof pipe 9 within the roll being mounted in a coupling 21 forming aportion of duct or pipe I6. A removable member 28 is provided on theopposite end of the roll to permit installation of scoop I5 within theinterior of the roll. Discharge pipe I1 extends from the opposite end ofthe roll through member 28, member 23 being mounted in suitable bearings28 in the frame 5 of the apparatus. It will be noted pipe I! is not incontact with the member 28 permitting open ends in the roll. Grooves 29may be formed in the exterior wall of pipe I! to entrap any water whichmay attempt to drain along such surface. Water collecting in grooves 29drops into recess 3I and returns to the interior of the roll. Ifdesired, a continuous groove or inside thread 29' may be formed in thewall of member 28 as shown in Figure 5 to direct water to the interiorof the roll when it is in operation. Thus, if any water creeps alongsuch surface, it is continually diverted toward the interior of theroll. No difficulty has been experienced in practice 4 due to the openends of the rolls for the water is maintained against wall 8 bycentrifugal forces when the roll is employed in operation at the highspeeds customarily used.

An additional feature of this modification re sides in the turbolator 32disposed adjacent the interior surface of wall 8. Turbolator 32 mayconsist of expanded metal, screening, or other suitable material. Aspointed out above, water is thrown against the interior surface of wall8 by centrifugal forces during rotation of the roll. In order to preventpossible slippage of water against such surface, turbolator 32 may beemployed to provide additional friction to the surface; in addition,turbulator 32 serves as a mechanical means for carrying water around theinterior of the roll. Centrifugal forces and the turbolator 32 assuresthat the water will be maintained about the periphery of the roll whenthe roll is in use. A further advantage of member 32 resides in the factthat it permits more efficient heat transfer for it breaks up oragitates water adjacent the surface of wall 8 and assures that waterdoes not remain in a stagnant condition adjacent such surface.

It will be noted a thermostat 33 is provided responsive to changes intemperature of leaving water. Thermostat 33 serves to regulate valve IIto increase or decrease the supply of cooling water to roll 2 inaccordance with the requirements of the operation. At reduced speeds,water requirements are less so that the decrease in temperature ofleaving water is refiected by thermostat 33 which actuates valve II todecrease supplyof water to the roll. Likewise, at higher speeds waterrequirements are greater so that the increase in temperature of theleaving water is reflected by thermostat 33 which then actuates valve IIto increase the supply of cooling water to the roll.

Scoop I5 in the modified form of my invention is somewhat different fromthat shown in Figure 1. As shown in Figure 6, scoop I5 may be more inthe form of a duct-like member 34 welded to discharge pipe II. Rotationof pipe I! may rotate member 34 to any desired angle; I have found thatsatisfactory results may be achieved regardless whether such portion isin vertical, horizontal or any intermediate position. The scoop portion23 may be adjusted within member 34 as shown in Figure 6 by means ofslots 35 and screws 36 as well known in the art.

It will be understood a plurality of scoops may be employed if desiredbut generally in the practice of my invention it is not necessary toemploy more than one such member.

The present invention provides a chilling roll sufiiciently light inweight to permit rotation by the webto be cooled passing thereover. Adesired film thickness of continuously changing water is maintainedadjacent the interior surface of the roll and serves to remove the heatfrom the web passing over the roll. Turbolator means provided agitatesuch film or layer thereby assuring that no portion of the coolingmedium stagnates adjacent such surface.

My invention provides a simple and eificient means of removing waterfrom the interior of the roll, such means being adjustable to assurethat a film of predetermined thickness is maintained adjacent the wallof the roll. Regulating members are provided responsive to changes intemperature of leaving water to assure that a desired volume of water issupplied to the interior of the roll, such water supply being a definitefactor in load requirements.

While I have described certain preferred embodiments of my invention, itwill be understood my invention is not limited thereto since it may beotherwise embodied within the scope of the following claims.

I claim:

1. In apparatus of the character described, the combination of arotatable, hollow roll terminating in support members, at least onesupport member being hollow, means for continuously supplying coolingmedium to the interior of the roll, centrifugal forces created byrotation of said roll urging the cooling medium against the interiorwall of the roll, a stationary discharge pipe extending through an endwall of the roll and through the hollow support member, a scoop memberconnected to said pipe, said scoop member extending adjacent theinterior longitudinal wall of the roll to maintain a desired depth ofcontinuously changing cooling medium adjacent the interior longitudinalwall of the roll, said scoop member being adjustable to vary the depthof said medium, said pipe having a plurality of grooves formed in itsexterior surface to entrap medium leaking from the roll and means on theinterior of the hollow support member to return medium to the interiorof the roll.

2. In apparatus of the character described, the combination of arotatable, hollow roll, a stationary supply pipe for cooling mediumextending through one end of the roll, said pipe having a plurality ofnozzles through which high velocity jets of cooling medium are impingedcontinuously against the interior longitudinal wall of the roll,centrifugal forces created by rotation of said roll urging the coolingmedium against the interior wall of the roll, turbolator means disposedagainst the interior wall of the roll to create agitation in the film ofmedium maintained adjacent thereto, a stationary discharge pipeextending through the opposite end of the roll, a scoop member connected to the discharge pipe, said scoop member extending adjacent theinterior longitudinal wall of the roll to maintain a desired depth ofcontinuously changing cooling medium adjacent the interior longitudinalwall of the roll, said scoop member being movable toward and from theinterior wall of the roll to vary the depth of the film maintainedadjacent the interior wall of the roll, and means for preventing leakageof medium along the exterior wall of the discharge pipe.

3. Apparatus according to claim 2 in which the turbolator means consistsof expanded metal disposed over the interior wall of the roll.

BERNARD OFFEN.

The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 971,176 Dexter Sept. 27, 19101,551,923 Amdursky Sept. 1, 1925 1,564,171 Brown Dec. 1, 1925 1,768,156Schroder June 24, 1930 1,768,777 Moller July 1, 1930 1,812,802 PriceJune 30, 1931 1,819,988 Jones Aug. 18, 1931 1,953,525 Young Apr. 3, 19341,994,360 Hurxthal Mar. 12, 1935 2,041,544 Hammond May 19, 19362,182,981 Drost Dec. 12, 1939 2,420,824 Hornbostel May 20, 1947 FOREIGNPATENTS Number Country Date 398,611 Germany July 11, 1924

